Using ChatGPT to design a light

[MoshJosh]

For fun I asked ChatGPT to help me choose what ratios of what spectrums to use for growing corals.

Prompt was a 12 diode light.

With my "help" it came up with:

• Blue: 3 LEDs (25%)
• Violet: 1 LED (8-9%)
• Royal Blue: 3 LEDs (25%)
• Cyan: 2 LEDs (16-17%)
• Red: 1 LED (8-9%)
• Cool White: 2 LEDs (16-17%)

But what SURPRISED me was chatGPT's suggesting for a "better" set up/ration. . . it suggested:

• Blue: 4 LEDs (33%)
• Royal Blue: 3 LEDs (25%)
• Cyan: 2 LEDs (16-17%)
• Violet: 1 LED (8-9%)
• Deep Red: 1 LED (8-9%)
• Warm White: 1 LED (8-9%)

ChatGPT "thinks" the warm white and deep red will:

"
Warm white light, which includes a mix of wavelengths across the visible spectrum, can help provide a more natural lighting appearance and balance the overall color rendition in the tank. It can also enhance visual aesthetics and promote the growth of symbiotic algae (zooxanthellae) that live within the coral.

Deep red light in the range of 660-680nm has been shown to influence coral behavior, such as polyp expansion and coral fluorescence. While it may not directly contribute to photosynthesis, it can still have positive effects on certain coral species by stimulating specific pigments and enhancing their coloration."

what is everyones thoughts?

 

[A_Blind_Reefer]

 

[taricha]

Deep red light in the range of 660-680nm has been shown to influence coral behavior, such as polyp expansion and coral fluorescence.

That's not accurate. To excite fluorescence, the light needs to be shorter wavelength - higher energy than the fluorescent light emission. If
660-680nm excited any fluorescent pigments, the emitted light would be longer wavelength and thus too red to see.

 

[Hooz]

Lol! It might be on to something! Sounds quite similar to the "Cyan" Prime HD LED pucks I just got from @luxdium, sans the red.

 

[flagg37]

That's not accurate. To excite fluorescence, the light needs to be shorter wavelength - higher energy than the fluorescent light emission. If
660-680nm excited any fluorescent pigments, the emitted light would be longer wavelength and thus too red to see.

I seem to remember a study done with pocillopora that showed that red light inhibited growth.

 

[oreo54]

I seem to remember a study done with pocillopora that showed that red light inhibited growth.

Correct but that was high par red and
" alone" or with a minimal " other" spectrum.

Red Light Represses the Photophysiology of the Scleractinian Coral Stylophora pistillata - PMC

Light spectrum plays a key role in the biology of symbiotic corals, with blue light resulting in higher coral growth, zooxanthellae density, chlorophyll a content and photosynthesis rates as compared to red light. However, it is still unclear ...

www.ncbi.nlm.nih.gov

Sooo don't run 100% red light

 

[Hooz]

I seem to remember a study done with pocillopora that showed that red light inhibited growth.

Around what wavelength does that big peak on the right of the chart look like to you?

 

[Jekyl]

That program doesn't think for itself. It scours the internet for articles and opinions. So maybe it's right or maybe it's some random guys opinion. Any second hand information is never going to be as good as first hand knowledge.

 

[flagg37]

Around what wavelength does that big peak on the right of the chart look like to you?

It’s been a long time since I researched this topic. I first looked into it because I just gotten the newly released ap700 and wanted to simulate a sunrise/sunset. I programmed them to start and end with full reds.

What I think I remember was the case was that Zooxanthellae used chlorophyll A and C but not B. This is why the reds played no role in photosynthesis for this organism. I could be wrong though. Maybe @Dana Riddle has some
insight on this.

 

[Hooz]

It’s been a long time since I researched this topic. I first looked into it because I just gotten the newly released ap700 and wanted to simulate a sunrise/sunset. I programmed them to start and end with full reds.

What I think I remember was the case was that Zooxanthellae used chlorophyll A and C but not B. This is why the reds played no role in photosynthesis for this organism. I could be wrong though. Maybe @Dana Riddle has some
insight on this.

The magenta line on the graph is for Chlorophyl A. Big spike around 450nm, and another big spike up in the 670-680nm range.

 

[oreo54]

It’s been a long time since I researched this topic. I first looked into it because I just gotten the newly released ap700 and wanted to simulate a sunrise/sunset. I programmed them to start and end with full reds.

What I think I remember was the case was that Zooxanthellae used chlorophyll A and C but not B. This is why the reds played no role in photosynthesis for this organism. I could be wrong though. Maybe @Dana Riddle has some
insight on this.

Effect of Red and Green Light on Coral

Hey all, this is a subject that I have been very interested in. I would like to get @Dana Riddle 's opinion on this as well as everyone else. Fairly recent studies suggest that green light has a greater impact on photosynthesis in terrestrial plants than previously thought. Because it is not...

www.reef2reef.com

Photosynthetic Efficiencies of LEDs: Results of Short Term Exposure to LED Lights

Dana Riddle studies zooxanthallae exposed to varying intensities and colors of LEDs between 365nm (UV-A) and 657nm (red). The collected data sheds light on how different spectra affect photosynthesis and the Xanthophyll Cycle, helping us to better understand how corals use and respond to light.

reefs.com

Perhaps the real story here is the photo-protective responses (the xanthophyll cycle) of zooxanthellae to different light sources, especially red light. Why is there little, if any, protective cycling of xanthophylls when strong red light is used? Strong doses of red light can regulate zooxanthellae densities even to the point of bleaching (Kinzie et al., 1984). What are the long term effects of red light on captive corals? This deserves investigation, and will be the subject of a future report.

 

[oreo54]

Ignore,
Wrong place.

 

[Northern Flicker]

This is why when I see people call my tank "windex" on these online forums and socials, instead of being annoyed, I embrace it. My coral seem quite happy in all the blue, especially LPS.